Design and Calculation of Reinforcement of Reinforced Concrete Structures of Buildings and Structures Using Steel Fiber Concrete

Abstract

The article presents options for strengthening and restoring load-bearing reinforced concrete structures of buildings damaged during operation. The effectiveness of using steel-fiber concrete to strengthen structures is due to the increased strength and deformation characteristics of the material compared to reinforced concrete. In addition, numerous theoretical and experimental studies have confirmed a 3–5-fold increased crack resistance of steel-fiber-reinforced concrete structures compared to reinforced concrete ones. The optimal characteristics of steel fiber concrete for use as reinforcement have been determined. Based on theoretical and experimental studies, the prerequisites and methodology for calculating bendable, compressed-curved and compressed reinforced concrete structures with zone reinforcement made of steel fiber operating under static and short-term dynamic loads are formulated. The developed method for calculating the strength of normal and inclined sections implements a nonlinear deformation model based on real diagrams of deformation of materials. For the possibility of practical application of these studies, an algorithm and a computer calculation program have been developed that allow the engineer to select the optimal parameters of steel fiber reinforcement, concrete and reinforcement for strengthening and restoring damaged reinforced concrete structures by variant calculation. During the calculation process, the percentage of overload of the structure is determined, the required gain level is determined taking into account the required margin factor, and a gain option with the necessary parameters is selected.